And a warning to the OP - if you do decide to set up a new DD mandate, don't do it within 10 days of a payment being due, otherwise you are likely to get stung with an additional £1.50 (I think) charge for paying by another method. Personally, I'd leave it as it is.
Kevin
plusnet Unlimited Fibre - sync approx 60000/20000 at 450m - BQM
Using OpenDNS
Domains and web hosting with TSOHOST